My question is this. I have your Sims 3 game and a few expansions downloaded (the latest I have is Pets). I now want to install more recent expansion packs (for example, University Life), as well as some of the older ones (like Ambitions). Since I already have the game + some expansion packs installed, do I need to un-install them? Or do I just install the expansions I want now and apply the latest crack/fixes according to the installation guide, as usual? I assume it's fine for the newest expansions but I don't know about the older ones.